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After upgrading from Fedora 16 to Fedora 17, Traffic Control no longer seems to work.

Running # tc qdisc show will output:

qdisc pfifo_fast 0: dev eth0 root refcnt 2 bands 3 priopmap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1

However, if I run # tc qdisc add dev eth0 root netem delay 100ms or similar commands such as # tc ... loss 2% or # tc ... corrupt 3% I get the following:

RNETLINK answers: No such file or directory

Downgrading back to Fedora 16 allows me to use Traffic Control without this problem, so I'm convinced it's not a hardware issue.

This question is similar to https://serverfault.com/questions/318926/tc-netem-possibly-missing but I believe the right components were installed by checking # yum provides */tc and ascertaining that tc is from the package iproute, whose latest installation I have.

Is netem part of another package I must also install?

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In Fedora 17 they moved a lot of unused (in common usage I guess) modules for the kernel into the package kernel-modules-extra.

Installing this package will fix the problem.

Source: https://serverfault.com/a/398964/112950

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